Untitled

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        // Original map with String keys and List<String> values
        Map<String, List<String>> mapWithList = new HashMap<>();
        mapWithList.put("key1", List.of("value1", "value2"));
        mapWithList.put("key2", List.of("value3", "value4"));
        mapWithList.put("key3", List.of("value5"));

        // New map with String keys and String values
        Map<String, String> mapWithFirstValue = new HashMap<>();

        // Iterate through the original map and take the first value from each list
        for (Map.Entry<String, List<String>> entry : mapWithList.entrySet()) {
            String key = entry.getKey();
            List<String> valueList = entry.getValue();
            if (valueList != null && !valueList.isEmpty()) {
                mapWithFirstValue.put(key, valueList.get(0));
            }
        }

        // Print the new map
        System.out.println(mapWithFirstValue);
    }
}